Journal of the Korean Academy of Pediatric Dentistry 2012;39(4):390-396.
Published online November 30, 2012.
ERUPTION GUIDANCE FOR TOOTH GERM OF PREMOLAR DISPLACED BY INFRAOCCLUDED UPPER DECIDUOUS MOLAR
Jung-Hwa Jung, Young-Jin Kim, Hyun-Jung Kim, Soon-Hyeun Nam
Department of Pediatric Dentistry, School of Dentistry, Kyungpook National University 
저위교합된 상악 유구치에 의해 변위된 소구치 치배의 맹출유도
정정화, 김영진, 김현정, 남순현
경북대학교 치의학전문대학원 소아치과학교실
Correspondence:  Soon-Hyeun Nam,  Tel: 053-600-7201, Email: shnam@knu.ac.kr
Received: 23 July 2012   • Accepted: 20 August 2012
Abstract
Infraocclusion is defined as tooth whose relative occlusal movement was blocked during the period of active eruption due to ankylosis and so on. Then infraoccluded tooth remains under the occlusal plane composed by adjacent structures showing normal eruption patterns. Untreated infraocclusion may cause: prolonged retention of infraoccluded teeth; extrusion of apposed teeth; destruction of periodontal tissues by occlusal force and food packing; increased sensitivity for dental caries; and disturbances on eruption pathway of succedaneous teeth. Therefore, periodic check-ups and proper treatments are required. There are many treatment options on infraoccluded deciduous molars such as periodic observation, conservative method, restoration and space regaining with extraction of the teeth. The choice of treatment may depend on the presence of succedaneous teeth, time of diagnosis and degree of infraocclusion. In this case report, three patients showing displacement of the second premolars due to infraocclusion of upper second primary molars, were treated by means of space regaining with removable orthodontic appliances and extraction of ankylosed primary molars. All malpositioned permanent premolars in the 3 cases showed ordinary eruption pathways after treatment.
Key Words: Infraocclusion, Ankylosis, Tooth germ displacement, Eruption guidance


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